20020556 has 24 divisors (see below), whose sum is σ = 36605520. Its totient is φ = 9568832.

The previous prime is 20020541. The next prime is 20020571. The reversal of 20020556 is 65502002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20020541) and next prime (20020571).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11606 + ... + 13218.

It is an arithmetic number, because the mean of its divisors is an integer number (1525230).

Almost surely, 2^20020556 is an apocalyptic number.

It is an amenable number.

20020556 is a deficient number, since it is larger than the sum of its proper divisors (16584964).

20020556 is a wasteful number, since it uses less digits than its factorization.

20020556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20020556 is about 4474.4335954398. The cubic root of 20020556 is about 271.5347257648.

Adding to 20020556 its reverse (65502002), we get a palindrome (85522558).

The spelling of 20020556 in words is "twenty million, twenty thousand, five hundred fifty-six".